€25m - €30m over a career in Europe vs €75m - €80m for a 5 year Saudi contract.
Some of these players really only play ball because they’re good at it and make good coin. They don’t really love the game
At 21, he can take the money now and still have a great second proper career at a top club somewhere. I presume he's a good disciplined pro having not got on Emery' shyt list, but the biggest danger is probably ballooning up over the course of his tenure in Saudi and then being unable to hack it at a major club in a major league, or injury. Injury is obviously an ubiquitous risk.
Seems like a waste of talent, but the money is absolutely crazy, and, as said, he still has time if he decides to leave the Saudi Camel Farmers League.